Create a plane across the wing at the lcoation of the camber line using the Create Plane option. While creating the plane, give a dimension larger than the wing, but smaller than the domain and also select "bounded" option. This will create a surface in the shape of the wing at the camber line. You can then refer to my previous suggestions to fix it. Refer the below links for more information.
4.11. Postprocessing Results (ansys.com)
https://www.youtube.com/watch?v=4Fbal1EiRDU
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